ION Project Papers & Info Sources

[Joachim M. Wagner]

Thanks so much, Gar
for your kind explanation, I joined your conversation first time yesterday
so I surely missed the earlier discussion. Can I find it anywhere?
But one thing's not quite clear to me about the ION-Sensor: What is the
advantage if they don't use it to modulate the following ignition signal in
a closed loop with the rest of the information out of the combustion
chamber after burning. That would be the real thing do do! This would bring
the quality of combustion up!

By the way how important is the quality aspect of combustion (exhaust
temperature, heat transfer, noise, lifetime of engine, acceleration, max
torque, a.s.o.) for you and for the people here in the group?  

Joachim 
----------
> Von: garfield at pilgrimhouse.com
> An: diy_efi at efi332.eng.ohio-state.edu
> Betreff: Re: ION Project Papers & Info Sources
> Datum: Samstag, 9. Mai 1998 18:22
> 
> On Sat, 9 May 1998 11:26:30 +0300, "Joachim M. Wagner"
> <1028-156 at online.de> wrote:
> 
> >What influence does this ion sensor
> >have on the e.f.i. or ignition system?? And what are the output signals
> >created from ECU given to the engine???
> 
> Eh? You musta just joined the thread. This has been discussed
> previously, so I'll just give ya a summary, and you can crawl up the
> thread for more of the details.
> 
> The ionization sensing gives two basic things to the ECU. One is signals
> to tell it if a jug fired or not (which they use instead of a cam
> sensor, and also for misfire detection). The second input to the ECU is
> an analog signal (is read by an A/D in the ECU) representing the actual
> analog ionization current, which they scan with the A/D to detect things
> like knock. This information is used to modify spark advance, boost
> limits, and even enrichment (enrichment is tried if backing off on adv &
> boost alone doesn't do the trick, according to the Saab manual).
> 
> There are no special inputs TO this IGN signal from the ECU, other than
> the normal ones to tell the plugs to fire. So it's basically a simple
> CDI system, with special sensor technology using the plugs, to return
> correct plug firing, and detonation/pre-ignition info to the ECU. That's
> it in a nutshell.
> 
> Anything very clever done to the analog Ionization current is being done
> INSIDE the ECU by the cpu, once the A/D is read.
> 
> Gar
>